Method for cultivating aerobic half-nitrosation granular sludge in continuous flow manner

Abstract

A method for cultivating aerobic half-nitrosation granular sludge in a continuous flow manner comprises the following steps: firstly, inoculating floccular nitrosation sludge to ensure that the flocculent nitrosation sludge can adapt to a continuous flow reactor, and building a microbial system taking aerobic ammonia-oxidizing bacteria as a main material; then adjusting the ascending velocity and aeration quantity on a certain section, so as to realize floccular sludge granulation on the basis that the ammoxidation rate and the nitrosation rate are certain; finally, unceasingly accelerating the ascending velocity and aeration quantity the section to improve the water flow shearing force and ensure that particle size grows fast. The aeration time and hydraulic power retention time are adjusted to ensure that the ammoxidation rate and the nitrosation rate are higher than 60 percent and 80 percent respectively, and the particle size grows in an enhanced manner. Therefore, the cultivation of aerobic half-nitrosation granules in the continuous flow manner is realized successfully.

Description

technical field [0001] The invention belongs to the field of water environment restoration and regeneration and the field of autotrophic denitrification of sewage treatment plants. In particular, it relates to a method for fast cultivating aerobic semi-nitrosating granular sludge which is specially used in normal temperature and continuous flow mode. Background technique [0002] Since the Eleventh Five-Year Plan, the state has stepped up efforts to control environmental pollution, especially in the restoration of the water environment, and implemented a major national science and technology project - Water Pollution Control and Treatment, with an investment of 11.266 billion yuan. This figure will further increase to more than 14 billion yuan. This move is to solve the problem of water eutrophication caused by excessive discharge of nitrogen and phosphorus in recent years. According to the 2012 Environmental Status Bulletin, the surface water in the country is generally s...

AI Technical Summary

Problems solved by technology

Anaerobic ammonium oxidation requires influent NO 2 - -N / NH 4 + -N ratio is 1.32:1, strict water inlet conditions become the technical bottleneck restricting the development of this process

Nitrosification is its premise and basis. In actual research, there are problems such as difficult retention and growth of sludge, poor impact load resistance, and easy instability in long-term operation.

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